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Publisher
- Geological Survey Division, (Urbana, Ill.)1
- Geological Survey and Water Resources (Rolla, Mo.)1
- Indiana Dept. of Conservation (Indianapolis, Ind.)1
- State Geological Survey Division (Urbana, Ill.)1
- State Survey (Urbana, Ill.)1
- State of Illinois State Geological Survey (Urbana, Ill.)1
- U.S. Army, War College1